<template>
  <div>
    <input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleClick">
    <div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
      将文件拖到这里 或
      <el-button :loading="loading" style="margin-left:16px;" size="mini" type="primary" @click="handleUpload">
        点击上传
      </el-button>
    </div>
  </div>
</template>

<script>
import XLSX from 'xlsx'
import axios from 'axios'
import {homeData} from "@/api/ledger/result";

export default {
  props: {
    beforeUpload: Function, // eslint-disable-line
    onSuccess: Function// eslint-disable-line
  },
  data() {
    return {
      loading: false,
      excelData: {
        header: null,
        results: null
      }
    }
  },
  methods: {
    generateData({ header, results }) {
      this.excelData.header = header
      this.excelData.results = results
      this.onSuccess && this.onSuccess(this.excelData)
      console.log(this.excelData.results.length, 'length')
      for (const key of this.excelData.results) {
        const params = {
          ledger_well_name: key.井号,
          ledger_well_id: key.ID,
          ledger_craft: key.清防蜡工艺,
          ledger_dosing_cycle: key.加药周期,
          ledger_dosage_amount: key.加药用量,
          ledger_hotwash_cycle: key.热洗周期,
          ledger_hotwash_amount: key.热洗用量,
          ledger_createdate: '',
          ledger_watertype: key.地层水型,
          ledger_salinity: key.矿化度,
          ledger_area: key.区队,
          ledger_experience_cycle: key.经验周期,
          ledger_check_cycle: key.核定周期
        }
        this.update(params)
        console.log('出现', params)
      }
    },
    update(params) {
      this.$http.post('/tAntiwaxLedger/update', {
        ledger_well_name: params.ledger_well_name,
        ledger_well_id: params.ledger_well_id,
        ledger_craft: params.ledger_craft,
        ledger_dosing_cycle: params.ledger_dosing_cycle,
        ledger_dosage_amount: params.ledger_dosage_amount,
        ledger_hotwash_cycle: params.ledger_hotwash_amount,
        ledger_hotwash_amount: params.ledger_hotwash_amount,
        ledger_createdate: params.ledger_createdate,
        ledger_watertype: params.ledger_watertype,
        ledger_salinity: params.ledger_salinity,
        ledger_area: params.ledger_area,
        ledger_experience_cycle: params.ledger_experience_cycle,
        ledger_check_cycle: params.ledger_check_cycle
      }).then(function(res) {
      })
      // const updata = params
      // homeData(updata).then(res => {
      //   console.log(res)
      // }).catch(err => {
      //   console.log(err)
      // })
    },
    handleDrop(e) {
      e.stopPropagation()
      e.preventDefault()
      if (this.loading) return
      const files = e.dataTransfer.files
      if (files.length !== 1) {
        this.$message.error('Only support uploading one file!')
        return
      }
      const rawFile = files[0] // only use files[0]

      if (!this.isExcel(rawFile)) {
        this.$message.error('Only supports upload .xlsx, .xls, .csv suffix files')
        return false
      }
      this.upload(rawFile)
      e.stopPropagation()
      e.preventDefault()
    },
    handleDragover(e) {
      e.stopPropagation()
      e.preventDefault()
      e.dataTransfer.dropEffect = 'copy'
    },
    handleUpload() {
      this.$refs['excel-upload-input'].click()
    },
    handleClick(e) {
      const files = e.target.files
      const rawFile = files[0] // only use files[0]
      if (!rawFile) return
      this.upload(rawFile)
    },
    upload(rawFile) {
      this.$refs['excel-upload-input'].value = null // fix can't select the same excel

      if (!this.beforeUpload) {
        this.readerData(rawFile)
        return
      }
      // const before = this.beforeUpload(rawFile)
      // if (before) {
      //   this.readerData(rawFile)
      // }
      console.log(this.readerData(rawFile), 'readerData')
    },
    readerData(rawFile) {
      this.loading = true
      return new Promise((resolve, reject) => {
        const reader = new FileReader()
        reader.onload = e => {
          const data = e.target.result
          const workbook = XLSX.read(data, { type: 'array' })
          const firstSheetName = workbook.SheetNames[0]
          const worksheet = workbook.Sheets[firstSheetName]
          const header = this.getHeaderRow(worksheet)
          const results = XLSX.utils.sheet_to_json(worksheet)
          console.log('我看看')
          this.generateData({ header, results })
          this.loading = false
          resolve()
        }
        reader.readAsArrayBuffer(rawFile)
      })
    },
    getHeaderRow(sheet) {
      const headers = []
      const range = XLSX.utils.decode_range(sheet['!ref'])
      let C
      const R = range.s.r
      /* start in the first row */
      for (C = range.s.c; C <= range.e.c; ++C) { /* walk every column in the range */
        const cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })]
        /* find the cell in the first row */
        let hdr = 'UNKNOWN ' + C // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
        headers.push(hdr)
      }
      return headers
    },
    isExcel(file) {
      return /\.(xlsx|xls|csv)$/.test(file.name)
    }
    // update(params) {
    //   this.$http
    //     .post('/tAntiwaxLedger/update', {
    //       params
    //     })
    // }
  }
}
</script>

<style scoped>
.excel-upload-input{
  display: none;
  z-index: -9999;
}
.drop{
  border: 2px dashed #bbb;
  width: 600px;
  height: 160px;
  line-height: 160px;
  margin: 0 auto;
  font-size: 24px;
  border-radius: 5px;
  text-align: center;
  color: #bbb;
  position: relative;
}
</style>
